In a previous theory of atoll formation, developed by Charles Darwin, coral forms in a ring around a volcanic island. When the volcano sinks beneath the surface it leaves behind a circular atoll.
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Scientists Drilled The Bottom Of Great Blue Hole And Uncovered 5,700 Years Of HistoryThe history of the Great Blue Hole in the Caribbean is being revealed by a 30-meter (98-foot) sediment core taken from the ...
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